/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.metadata;

import com.facebook.presto.spi.function.OperatorType;
import com.google.common.annotations.VisibleForTesting;

import static com.google.common.base.Preconditions.checkArgument;

public final class OperatorSignatureUtils
{
    private static final String OPERATOR_PREFIX = "$operator$";

    private OperatorSignatureUtils() {}

    public static String mangleOperatorName(OperatorType operatorType)
    {
        return mangleOperatorName(operatorType.name());
    }

    public static String mangleOperatorName(String operatorName)
    {
        return OPERATOR_PREFIX + operatorName;
    }

    @VisibleForTesting
    public static OperatorType unmangleOperator(String mangledName)
    {
        checkArgument(mangledName.startsWith(OPERATOR_PREFIX), "%s is not a mangled operator name", mangledName);
        return OperatorType.valueOf(mangledName.substring(OPERATOR_PREFIX.length()));
    }
}
